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Learn how Rails loads yaml configuration and how you can define your own configuration options with the Rails config object
Rails 6.1 introduces a new feature called "disallowed_warnings" which causes exceptions to be thrown anytime deprecated code is run. This makes it really easy to track down deprecations in your code and fix them quickly.
Rails 5.2's adds CurrentAttributes to give you access to global variables in your apps. We'll use this feature to implement a Rack middleware to build Basecamp 3 style URLs that automatically include the current Account ID in every URL
Rather than serving your user's a 404 dead end, we can use the ActiveSupport rescue_from method to give users search results instead and how to reuse this with ActiveSupport Concerns
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